$zbg->setBG({image='/tmp/something.jpg', filltype=>'auto'});
if($zbg->{error}){
print "Error!\n";
}
#the same as the above, but not saved to the last list
$zbg->setBG({image='/tmp/something.jpg', filltype=>'auto', dontSave='0'});
if($zbg->{error}){
print "Error!\n";
}